Nailing-machine



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NAILENQMAGHITIE.

Specification of Letters Patent.

Patented J une 28, 1921.

To all whom t may concern:

Be it known that we, Josnrri F. PENNER and LDA A. LANSBERRY, citizens of the United States, and residents of New Castle and Vandergrift, in the counties of Lawrence and Westmoreland and State of Pennsylvania, have invented a new and useful improvement in N ailing-Machines, of which the following is a specification.

The invention relates to nailing machines such as are now commonly used for various purposes, including the manufacture of packing boxes and the nailing of lids upon them after they have been packed. Each machine includes a head and a chuck holding member mounted on a suitable frame for reciprocation with relation to each other. rll'he chuck holding member is usually provided with a plurality of nail-holding chucks and the heads with plungers, the chucks and plungeis forming nail-driving elements, c0- operating in pairs to ,drive a plurality of nails simultaneously.

In the use of these machines, it frequently happens that, because of the irregularity of the face of an article into which nails are driven, some nails are driven too far andv others not far enough. This is objectionable at all times and in all uses of a machine, but is particularly objectionable when the nailing machine drives nails through metal straps with which the boxes are bound and reinforced. When the nails are driven too far into the straps the heads of the nails are broken ofi', or, more frequently, they are punched entirely through the straps with the result that the straps are not properly nailed to the'boXes.

rlhe object of the invention is'to provide a nailing machine with nail-driving elements arranged in pairs, each pair of which will, during each cycle of operation of the machine, drive a nail to such extent as may be necessary, depending upon whatever elevation or depression there may be Iin the face of the article at the place where the nail is driven.

The invention is illustrated in the accompanying sheets of drawingsQof which ltigure 1 is a side view of a pair of naildriving elements with the part-s in their positions at the com letion of the driving operation; Fig. 2 a ace view of the parts in vposition near the end of the driving stroke; Fig. 3 a sectional view taken on the line lll- IH F ig. 2; and Fig. 4 a detail paral sctional'view taken on the line lV--IV 1g. In the drawings there is illustrated a single pair of nail-driving elements comprising a nail-holding chuck' l and a plunger holder 2, the former being suitably attached topa machine part 3, and the latter to a machine part 4, which parts are mountled for reciprocation with relationY to each other. Usually, the holder 2 is mounted upon a reciprocating head 4 and the chuck l on a fixed part 3 of the machine frame, and this is the type of machine with which the present invention is illustrated. The nailholding chuck 1 is of familiar form and includes a pair of jaws 5 and 6 pivoted to the chuck frame at 7y and 8 and normally urged toward each other by means of adjustable compression springs 9 and 10, respectively. Through the chuck and between the jaws 5 and 6 a plunger 11 attached to the holder 2 reciprocates and drives nails which are fed to the chuck through a suitable flexible conduit 12. The manner of feeding nails to the chuck and of reciprocating-the head 4 are features of construction well .known to those familiar with'machines of thistype, and hence are not illustrated herein.

In the practice of the invention, each plunger is independently locked or connected to the holder, `and means, preferably in the frm of a trip operated by the relative movements of the nail-driving elements, is provided for unlocking or releasing each plunger at variable relative positions of such elements, depending upon the elevation of the face of the article at the particular point where a nail is being driven.

ln the embodiment of the invention specifically illustrated in the drawings, the plunger 11 is adapted to be locked in its holder 2 by means of a latch 14 pivoted at 1 5 to the holder, the plunger being provided with a head in the form of a block 13 having a beveled face 16 adapted to be 'engaged by an offset portion formed on the lowerv end of the latch. To hold the latch in plunger-locking position, a dog 17, normally pressed downwardly by means of a spring 18, is mounted for vertical reciprocation in holder 2, the dog being provided with a lateral projection 19 adapted to bear against a similarly foi-med projection 20 at the lower end of the latch. To adjust or vary the effective sortirent, a coaroanrron length of the dog, its lower end may pro# vided with a set screw 2l. The positions of y 'the plunger 11, latch `lil, and dog 17 for lower end may be brought 'to 'bear upon the race of the article being nailed. The trip may., as particularly illustrated in 1l, have a dcvetailed sliding connection with chuck 1, and may be provided at its upper and with a lateral projection 22 adapte-d to he engaged by the set screw 2l atrthe lower ci dog l? when the holder 2 movesdownwardly. ller holding trip 21 normally ,above the ylace oit an'ar'ticle 23 into which nails are' being driven, a suitable r,spring 25 may be arranged between chuclr 1 and the lateral projection 22 of trip 21.

ln the operation ot the machine, when the plunger holder 2 is"raised, the lower end of plunger 11 is drawn upwardly through chuck 1 to such position that a nail ted through conduit 12 may tall downwardly between and be properly engaged by the signing-pressed` jaws 5 and 6. Alter the holder 2 has been raised to such position that the set screw 2lat the lower end ci dog 17 no longer bears upon the lateral projection 22 ot trip 21, spring 18 presses the dog downwardly with the result'that latch 14 is moved laterally toward block 13 to lock the plunger to the head. When the plunger holder moves downwardly, plunger 11 strikes the head of a nail engaged by the jaws 5 and 6 and presses or drives the nail into the article 23. The adjustment of holder 2 with relation to chuck 1 andof set screw 24 at the lower end of dog 17 is such that when the holder nears the end of its downward movement, set screw 24 bears upon lthe lateral projection 2 2 of the trip. The further downward movement of the holder causes tri 21 to also move downwardly until its lower'end bears u on the face of the article into which the nail is being driven. Still further downward movement of the plunger holdercauses dog 17 to move upwardly through the holder until the dog is in the position indicated in Fig. 1,

at which'time the beveled face 16 of block 13 at the upper end of the plunger forces the latch 14 to the right and permits -thefpluner to move upwardly. LThus, further driving of the nail is stopped.

lt will be observed that the means for releasing the' connection or locking of the plungerto its holder are rendered operative at a point in the downward movementcl the holder depending upon the elevation oi the i: ace or the article at the particular point'at ch the nail is being driven. rlhus, il the is elevated, the plunger will be low the released before the nail is driven toc lar inte the article, and iii the tace of the article is plunger will continue to drive the nail until it has reached the proper dep When a nail driving machine is pros with a plurality or coperating naildrivin@y1 elements, each nail is independently driven to 'the required amount depending upon the elevation of the lace of the article particular point at which each nail is driv According to the provisions ol the pat statues, we have described the principle and operation ot our invention, together with what we now consider to be the best embodiment thereof. lrlowever, we desire to have it understood that, within the scope ot the appended claims, the invention may be practised with other forms of construction than that specifically shown and described.

We claim:

1. ln a nailing machine, the combination with nail-driving elements comprising nailholding chuck and a plunger holder reciprocable with relation to each other, and a plunger borne by the holder and reciprocable in the chuck; oi means for locking the plunger to said holder, and means operated by the relative movements ol said elements ior releasing said plungerdoclring means at variable relative positions ol said elements.,

2. ln a nailing machine, the combination with naildriving elements comprising a nail-holding chuck and a plunger holder reciprocable with relation to each other, and a plunger borne by the holder and recip rocable in the chuck; of means for locking the plunger to said holder, and a trip borne by one of said nail-driving elements in position to bear upon .the face of an article being nailed,` said trip being movable with re lation to said elements to release said plunger-locking means. Y

3. ln a nailing machine, the combination with nail-driving elements comprisingl a nail-holding chuck and a plunger holder reciprocable with relation to each other, and a plunger borne by the holder and reciprocable in the chuck; of a latch for locking the plunger to the holder, a movable member for holding the latch in locking position, and a trip .borne by one of said nail-driving elements in position to bear upon the face of machine, combination cnucir, plunger holder for holdin the latch in plunger-locking poreciprocable with relation theretc,v a lunger borne by said holder afnd reciproca le in the chuck, a releasable latch for locking the plunger to 'said head, and a trip finger borne by the chuck in position to bear upon the face of an article being nailed and movable to release said latch at variable positions of said holder with relation to the chuck.

6. In a nailing machine, the combination of a nail-holding chuck, a plunger holder reciprocable with relation thereto, a plunger borne by said holder and reciprocable in the chuck, a releasable latch for locking the plunger to said holder, a movable member sition, an a trip arranged between said latch-holding'member and the face of an article being nailed and adapted when bearing upon such face .to move said member from latch-holding position.

7. In a nailing machine, the combination with naildriving elements comprising a nail-holding chuck and a plunger holder reciprocable with relation to each other, and

a plunger borne by the holder and reciprocable in said chuck; of a movable latch for locking the plunger to the holder, a movable dog for holding the latch in plunger-locking position, and a trip borne by one of said nail driving elements and arranged between said dog and the face of an article being nailed whereby said trip when bearing upon such face moves said dog to latchreleasing position.

8. In a nailing machine, the combination of a nail-holding chuck, a plunger holder reciprocable with relation thereto, a plunger borne by said holder and reciprocable in the chuck, a pivoted latch for locking the plunger to the holder, a movable dog-spring pressed toward latch-locking pos1t1on, a trip finger slidably mounted on said chuck and arranged between said dog and the face of an article being nailed, the movement -of the holder being effective to bring said dog in engagement with the trip linger whereby the dog is moved to latch-releasing position.

In testimony whereof, we hereunto sign our names.

JOSEPH F. PENNER. ALDA A. LANSBERRY. Witness:

EDWIN O. JOHNS. 

